Smoke-preventing furnace.



J. 11. I MoKEE. SMOKE PREVENTING FURNACE. APPLTQATION FILED MAR. 31,1910.

990,36 1 Patented Apr. 25,1911.

' Jasper N. N Ke e;

- 1'14: NORRIS PETERS cc., wasumnron, n. c.

UNIT TATE ATE FFItC.

JASPER N. MCKEE, F INDIANAPOLIS, INDIANA.

SMOKE-PREVENTING FURNACE.

Application filed March 31,

T 0 all whom it may concern:

Be it known that I, JASPER N. MoKnn, a citizen of the United States,residing at Indianapolis, in the county of Marion and State of Indiana,have invented a new and useful Smoke-Preventing Furnace, of which thefollowing is a specification.

Heretofore many devices have been pro duced for the consumption of fuelunder 3' non-smoke-producing conditions and many of such devices haveinvolved the use of steam or air jets for forcing steam or air into thecombustion chamber over the fuel in order to supply the necessary amountof oxygen at proper temperature for the complete combustion of thevolatile portions of the fuel. While some of such devices have beensuccessful so far as the elimination of smoke is concerned, yet suchdevices have, so far as I am aware, been objectionable because of theintense heating effect upon a comparatively small portion of the boilerimmediately above the grates. This has been due to the fact that thesteam or air ets had been introduced into the combustion chamber undersuch conditions as to concentrate the combustion within the spaceimmediately above the grates.

The object of my present invention is to provide an apparatus which willovercome the difficulty referred to.

The accompanying drawings illustrate my invention.

Figure 1 is a longitudinal vertical section of a boiler settingconstructed in accordance with my invention; Fig. 2 a horizontalsection, on an enlarged scale, on line 22 of Fig. 1; Fig. 3 a section online 83 of Fig. 1.

In the drawings, 10 indicates a setting for an ordinary fire tube boiler11, said setting being, in its general features, the same as anyordinary setting and comprising the side walls 12, 12, front wall 13 andbridge wall 14:, the drawings being intended merely as a typicalillustration.

Leading through the front wall 13 of the setting at the front corners ofthe combustion chamber 15 are two nozzles 16 and 17 of any desired typebut conveniently formed of ordinary piping with horizontally flattenedends, as indicated, in order to deliver a sub, stantially horizontal fanshaped blast. These two nozzles are directed toward the rear middle ofthe combustion chamber and in practice I find that it is desirable tohave the two streams from the nozzle converge at Specification ofLetters Patent.

Patented Apr. 25, 1911.

1910. Serial No. 552,610.

a point about one-third of the distance in front of the bridge wall, theexact distance depending to some extent upon the length of the boilerand setting. It is not desirable however that the two streams actuallyconverge but that, instead, one pass beneath the other and as aconsequence one of the nozzles is properly set slightly lower than theother, as indicated in Fig. 3.

With the two nozzles 16 and 17 alone I find that a whirl or vortex ofburning gases is produced which, while it materially increases thecombustion within the chamber and thoroughly mixes the volatilematerials of the fuel with the incoming air or steam so as topractically prevent smoke, yet such action so concentrates thecombustion as to practically produce a strong jet of high tem peratureagainst the shell of the boiler immediately above the grate bars, thetemperature being so high as to soon burn out the shell of the boiler.Such an action is very undesirable and, in many cases, is thoroughlyimpractical because of the expense of up keep. In order therefore toovercome this objection I provide a middle nozzle 18 which is arrangedsomewhat above the planes of the nozzles 16 and 17 quite close to thelowest plane of the boiler shell, as indi cated in Figs. 1 and 2. Theblast from the nozzle 18 operates somewhat as a blanket for the hightemperature jet produced by the whirling gases resulting from the actionof nozzles 16 and 17 and directs the entire volume of burning gasesrearwardly under the boiler shell and over the bridge wall. This resultsin a distribution of the heat along the entire length of the shell so asto protect the shell against burning, but without decreasing the actualheating effect upon the water so that the steaming capacity of theboiler is not in any way diminished.

By this arrangement there is some slight tendency toward the productionof smokeproducing gases at the rear corners of the combustion chamber.In order to overcome this slight difiiculty I form horizontal passages21 in each side wall 12. At its rear end each of these passages 21 opensat 22 into the combustion chamber a short distance in front of thebridge wall and its forward end opens into the combustion chamber at 23immediately around the nozzle 16 or 17, the nozzle being placed slightlywithin the passage so as to produce upon the passage an aspirator effectwhich will draw a considerable quantity of unconsumed gases from therear corners of the combusion chamber and discharge them again into theforward corners of the combustion chamber. These gases, which are drawnforwardly through the passages 21, are at a very high temperature butare lacking in oxygen. The consequence is that they will superheat thesteam issuing from the nozzles 16 and 17 (if steam is used) and thusdeliver dry steam into the combustion chamber, and the steam willdeliver a suflicient quantity of air to the gases to cause them toignite.

I claim as my invention 1. The combination, with a combustion chamberhaving a suitable outlet and a pair of gas passages formed at each sideof the chamber and communicating with the chamber at their front andrear ends, of a pair of blast nozzles arranged within the front ends ofthe gas passages and directed rearwardly into the combustion chamberfrom the forward corners thereof at different levels so as to produceconverging overlapping streams, a third blast nozzle directed rearwardlyinto the forward end of said combustion chamber between the two firstnozzles and at a higher level, and means for supplying a blast to saidnozzles.

2. The combination, with a combustion chamber having a suitable outlet,of a pair of blast nozzles directed rearwardly into the combustionchamber from the forward corners thereof at different levels so as toproduce converging overlapping streams, a third-blast nozzledirectedrearwardly into the forward end of said combustion chamberbetween the two first nozzles and at a higher level, and means forsupplying a blast to said nozzles.

3. The combination, with a combustion chamber having a suitable outletand a pair of gas passages formed at each side of the chamber andcommunicating with the chamber at their front and rear ends, of a pairof blast nozzles arranged within the front ends of the gas passages anddirected rearwardly into the combustion chamber from the forward cornersthereof so as to produce converging streams, a third blast nozzledirected rearwardly into the forward end of said combustion chamberbetween the two first nozzles and at a higher level, and means forsupplying a blast to said nozzle.

4:. The combination, with a combustion chamber of a pair of blastnozzles directed rearwardly into the combustion chamber from the forwardcorners thereof so as to produce diagonal overlapping blast streams,means for supplying said nozzles with a suitable blast, and means forproducing a rearwardly directed blanket-blast above the said pair ofblast nozzles.

In witness whereof, I have hereunto set my hand and seal atIndianapolis, Indiana, this 29th day of March, A. D. one thousand ninehundred and ten.

JASPER N. MoKEE.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, 1). G.

